Sister, please trust and believe what I am going to type here:
People who don't want marriage or kids mean what they say. Even if you "convince them," they still don't want marriage or kids and will be resentful and leave you and the kids. These people do not change their minds; they told you the truth up front.
Move in? Just don't. The dude TOLD YOU he doesn't want to be married. If you move in, you'll be a "roommate with benefits" for life, NOT a wife. This man wants his way, but doesn't respect your beliefs - he would never have suggested this otherwise.
You're not lost, just heartbroken because you clearly love this man and want it to work. It won't.
I'm sorry to be so real, but you need the truth before this situation gets worse for you.
Trust God and Be Blessed, dear one.